When something happens to you that is considered by many to be an extremely rude breach of social standard. This includes getting dissed, getting slapped, being swiftly rejected by a girl you've been making advances on, when someone or something causes unnecessary hardship, or even being ignored my your mum. In short, it is getting demoralised. Hard.
The term was popularised by London rapper Tempa-T, with his song 'Next Hype'.
It is possible that Par is a derivative of the term Faux Pas, which in french literally means a 'False Step' against the established norm.
1.
Ricky: Yo gal you lookin kinda nice tonight, mind if i get you a drink?
Girl: Errr...get out of my face, don't talk to me. I think you need some aquafresh as well, cos your breath is kickin! Dem trainers aint real either. Ricky's mate: Ricky Bruv, you just got parred.
2.
Ricky: Eh Mum! What you cookin' tonight? Smells taaassty!!!
(no response)
Ricky: Mum...Mum?! Ah allow it.
Ricky's mate: Ricky bruv, you just got parred, by your own mum.
3.
Tempa-T: I SAY GET OUT DA CAR!
Ricky: Ah allow it..
Ricky's mate: Par.
4.
Ricky's mum: Ricky, go shops and get me a coke and some skittles. Maybe some skips as well. Fuck it, i'll right you a list.
Ricky: Where is it?
Ricky's mum: 'Bout half hour away, if you hop on a bus.
Ricky: Mum, i aint got money for the bus.
Ricky's mum: Walk then.
Ricky: Ah allow it, thats long
Ricky's mate: Ricky Bruv, you keep gettin' parred.